Sit-up exercise device



FIG. 1 is a perspective view of a sit-up exercise device of the presentdesign;

FIG. 2 is a side elevational view thereof, the right and left sidesbeing mirror images of each other;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines shown in the Figures are for environmental purposesonly and form no part of the claimed design.

The ornamental design for sit-up exercise device, as shown anddescribed.